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ASoC: Add support for WM8962 GPIO outputs 

The WM8962 features five GPIOs, add support for controlling their output
state via gpiolib.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-09-20 17:34:58 +01:00
parent 205d231bfb
commit 3367b8d427
3 changed files with 121 additions and 0 deletions
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1
include/sound/wm8962.h
View File

@ -15,6 +15,7 @@
#define WM8962_GPIO_SET 0x10000
struct wm8962_pdata {
int gpio_base;
u32 gpio_init[WM8962_MAX_GPIO];
/* Setup for microphone detection, raw value to be written to

119
sound/soc/codecs/wm8962.c
View File

@ -17,6 +17,7 @@
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/gcd.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/platform_device.h>
@ -70,6 +71,10 @@ struct wm8962_priv {
struct work_struct beep_work;
int beep_rate;
#endif
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio_chip;
#endif
};
/* We can't use the same notifier block for more than one supply and
@ -1646,6 +1651,118 @@ static void wm8962_free_beep(struct snd_soc_codec *codec)
}
#endif
#ifdef CONFIG_GPIOLIB
static inline struct wm8962_priv *gpio_to_wm8962(struct gpio_chip *chip)
{
return container_of(chip, struct wm8962_priv, gpio_chip);
}
static int wm8962_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct wm8962_priv *wm8962 = gpio_to_wm8962(chip);
struct snd_soc_codec *codec = wm8962->codec;
int mask = 0;
int val;
/* The WM8962 GPIOs aren't linearly numbered. For simplicity
* we export linear numbers and error out if the unsupported
* ones are requsted.
*/
switch (offset + 1) {
case 2:
mask = WM8962_CLKOUT2_SEL_MASK;
val = 1 << WM8962_CLKOUT2_SEL_SHIFT;
break;
case 3:
mask = WM8962_CLKOUT3_SEL_MASK;
val = 1 << WM8962_CLKOUT3_SEL_SHIFT;
break;
case 5:
case 6:
break;
default:
return -EINVAL;
}
/* Some of the GPIOs are behind MFP configuration */
if (mask)
snd_soc_update_bits(codec, WM8962_ANALOGUE_CLOCKING1,
mask, val);
return 0;
}
static void wm8962_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct wm8962_priv *wm8962 = gpio_to_wm8962(chip);
struct snd_soc_codec *codec = wm8962->codec;
snd_soc_update_bits(codec, WM8962_GPIO_BASE + offset,
WM8962_GP2_LVL, value << WM8962_GP2_LVL_SHIFT);
}
static int wm8962_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
struct wm8962_priv *wm8962 = gpio_to_wm8962(chip);
struct snd_soc_codec *codec = wm8962->codec;
int val;
/* Force function 1 (logic output) */
val = (1 << WM8962_GP2_FN_SHIFT) | (value << WM8962_GP2_LVL_SHIFT);
return snd_soc_update_bits(codec, WM8962_GPIO_BASE + offset,
WM8962_GP2_FN_MASK | WM8962_GP2_LVL, val);
}
static struct gpio_chip wm8962_template_chip = {
.label = "wm8962",
.owner = THIS_MODULE,
.request = wm8962_gpio_request,
.direction_output = wm8962_gpio_direction_out,
.set = wm8962_gpio_set,
.can_sleep = 1,
};
static void wm8962_init_gpio(struct snd_soc_codec *codec)
{
struct wm8962_priv *wm8962 = snd_soc_codec_get_drvdata(codec);
struct wm8962_pdata *pdata = dev_get_platdata(codec->dev);
int ret;
wm8962->gpio_chip = wm8962_template_chip;
wm8962->gpio_chip.ngpio = WM8962_MAX_GPIO;
wm8962->gpio_chip.dev = codec->dev;
if (pdata && pdata->gpio_base)
wm8962->gpio_chip.base = pdata->gpio_base;
else
wm8962->gpio_chip.base = -1;
ret = gpiochip_add(&wm8962->gpio_chip);
if (ret != 0)
dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret);
}
static void wm8962_free_gpio(struct snd_soc_codec *codec)
{
struct wm8962_priv *wm8962 = snd_soc_codec_get_drvdata(codec);
int ret;
ret = gpiochip_remove(&wm8962->gpio_chip);
if (ret != 0)
dev_err(codec->dev, "Failed to remove GPIOs: %d\n", ret);
}
#else
static void wm8962_init_gpio(struct snd_soc_codec *codec)
{
}
static void wm8962_free_gpio(struct snd_soc_codec *codec)
{
}
#endif
static int wm8962_probe(struct snd_soc_codec *codec)
{
int ret;
@ -1778,6 +1895,7 @@ static int wm8962_probe(struct snd_soc_codec *codec)
wm8962_add_widgets(codec);
wm8962_init_beep(codec);
wm8962_init_gpio(codec);
if (i2c->irq) {
if (pdata && pdata->irq_active_low) {
@ -1828,6 +1946,7 @@ static int wm8962_remove(struct snd_soc_codec *codec)
if (i2c->irq)
free_irq(i2c->irq, codec);
wm8962_free_gpio(codec);
wm8962_free_beep(codec);
for (i = 0; i < ARRAY_SIZE(wm8962->supplies); i++)
regulator_unregister_notifier(wm8962->supplies[i].consumer,

1
sound/soc/codecs/wm8962.h
View File

@ -181,6 +181,7 @@
#define WM8962_EQ39 0x175
#define WM8962_EQ40 0x176
#define WM8962_EQ41 0x177
#define WM8962_GPIO_BASE 0x200
#define WM8962_GPIO_2 0x201
#define WM8962_GPIO_3 0x202
#define WM8962_GPIO_5 0x204